How are Cyclones Categorized and How are they Named?

Categorization of Cyclones

There are five TCWCs and six RSMCs worldwide, including the India Meteorological Department (IMD). Based on the greatest sustained wind speed, the India Meteorological Department (IMD) has categorized low-pressure systems in the Arabian Sea and the Bay of Bengal. You can learn about the different kinds of disturbances and the associated wind speed in the following table:

Type of Disturbance	Wind Speed
Low-pressure area	Less than 31 km per hour
Depression	31-49 km per hour
Deep depression	50-61 km per hour
Cyclonic storm	62-88 km per hour
Severe cyclonic storm	89-117 km per hour
Severe cyclonic storm	118-167 km per hour
Very severe cyclonic storm	168-221 km per hour
Super cyclonic storm	222 km per hour

Naming of Cyclones

• Tropical cyclones are typically named following regional regulations.
• Tropical cyclone names are given alphabetically and alternate between women’s and men’s names in the Atlantic and Southern Hemispheres (the Indian Ocean and South Pacific).
• Nations adopted a new system of gender-neutral names for tropical cyclones in the northern Indian Ocean in 2000.
• The names are listed alphabetically by nation.

Summary:

How are Cyclones Categorized and How are they Named?

The National Meteorological and Hydrological Services (NMHS) of the WMO members in a particular region typically suggest the terminology of Cyclones, which is then approved by the appropriate regional tropical cyclone authorities at their annual/biennial meetings.

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